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Phys. Rev. Lett. 99, 087602 (2007) [4 pages]

Field-Induced Order-Disorder Transition in Antiferromagnetic BaCo2V2O8 Driven by a Softening of Spinon Excitation

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S. Kimura1, H. Yashiro1, K. Okunishi2, M. Hagiwara1, Z. He3, K. Kindo3, T. Taniyama4, and M. Itoh4
1KYOKUGEN, Osaka University, Machikaneyama 1-3, Toyanaka 560-8531, Japan
2Department of Physics, Niigata University, Niigata 950-2181, Japan
3Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8531, Japan
4Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori Yokohama 226-8503, Japan

Received 16 April 2007; published 24 August 2007

High field magnetization and ESR measurements on the quasi-one-dimensional (1D) antiferromagnet BaCo2V2O8 have been performed in magnetic fields up to 50 T along the chain. The experimental results are explained well in terms of a 1D S=1/2 antiferromagnetic XXZ model in longitudinal fields. We show that the quantum phase transition from the Néel ordered phase to the spin liquid one in the model is responsible for a peculiar order to disorder transition in BaCo2V2O8.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.087602
DOI:
10.1103/PhysRevLett.99.087602
PACS:
76.50.+g, 75.10.Pq, 75.50.Ee
 
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